The Battle of the Argonne Forest was a World War I military engagement, fought between the American Expeditionary Force and the German Imperial Army, from September 26 to November 11, 1918, in the forest of Argonne, on the Meuse River, northeastern France.
Answer: the American expeditionary force
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This is true. The battle of Palmito Ranch occurred from May 12, 1865 to May 13, 1865 while the Civil War ended on May 9, 1865.
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B. They both became territories of the United States